509 F02012800-000-401 - Ignite heated inner lens - Durable PC outer lens with multiple coatings for premium clarity and performance - UV inhibitors, Hardness and anti-scratch, and Oleophobic coatings 5MAG lens retention system, Soft goggle frame for unparalleled comfort and fit Hard lens frame insures an optimal fit, and a great sealing with 5MAG Lens Retention System, OTG, Over The Glasses, compatible Shuttered Venting in frame scoop air in or closes off flow, Easily replace lens for varying conditions, Removable outriggers Improved tints, low light, and contrast improving technologies, Recommended Charger for Ignite S1 is 5V, 1.5A Is the coolest thing about the 509.